An ancient method of diplomacy from the Emerald Isle. Two men who have an issue with each other agree to sit down at a table with a bottle of whisky between them. As they discuss their issue, they must match each other shot for shot. The diplomatic relations are not over until the bottle is gone or someone dies.

"Hey, why were you hanging out with Emily? I thought you hated that chick for stealing from you."
"It's all fine now, we used Irish Diplomacy and worked everything out"